add function to receive cashu into new token

src/cashu.ts

@@ -1,4 +1,4 @@
-import {getDecodedToken, type Proof} from "@cashu/cashu-ts";
+import {CashuMint, CashuWallet, getDecodedToken, getEncodedToken, type Proof} from "@cashu/cashu-ts";
 import type {TokenEntry} from "@cashu/cashu-ts";
 import {getMailSubscriptionDurationForSats} from "./general.ts";
 
@@ -44,6 +44,18 @@ export class TokenInfo {
     this.mint = tokens[0].mint;
     this.proofs = tokens.flatMap(t => t.proofs);
   }
+
+  async receive(): Promise<string> {
+    const mint = new CashuMint(this.mint);
+    const wallet = new CashuWallet(mint);
+    const newToken = await wallet.receive(this.tokenString);
+    return getEncodedToken({
+      token: [{
+        mint: this.mint,
+        proofs: newToken
+      }]
+    });
+  }
 }
 
 export class TokenInfoWithMailSubscriptionDuration extends TokenInfo {